Improvement in hydraulic lifting-jacks



UNITED STATES PATENT Ori-ICEO JAMES TANGYE, OF BIRMINGHAM, ENGLAND.

IMPROVEMENT IN HYDRAULIC LlFTlNG-JACKS.

Specification forming part of Letters Patent No. 38,187, dated April 14, 1863.

To a/ZZ whom it may concern:

Be it known that I, J AMES TANGYE, of the iism of Tangye Brothers 8U Price, of Birmin gham,in the county of Warwick, manufacturers, a subject of the Queen of Great Britain, have invented or discovered a new and useful Improvement or Improvements in Hydraulic Lifting-Jacks; and l, the said JAMES TANGYE, do hereby declare the nature of the said invention and in what manner the saine is to be performed to be particularly described and ascertained in and by the following statement thereofthat is to say:

My invention consists of the improvement or improvements hereinafter described, and lllustrated in the accompanying drawings, in constructing or arranging the parts of hydraulic lifting-jacks.

Figure l of the accompanying drawings represents, in elevation, a hydraulic lifting-jack made according to my invention. Fig. 2 represents a vertical section of the same; and Fig. 3 represents a horizontal section of the same, taken through the line 4, Fig. l.

I make the ram a of the jack solid, the said ram being made in one piece with or xed upon the foot b of the jack. The cylinder c is made of solid steel or other metal, and works upon the said ram c, rising and falling thereon. The said cylinder has a claw, dat its bottom, whereby lift from the ground can be had when required. On the top of the cylinder c the reservoir e, containing the water or oil or other liquid with which the jack is worked, is situated. The pump f (constructed and worked in the manner hereinafter described) is situated within the reservoir e, and the cylinder c, reservoir e, and pump f therein rise together. A liquid-tight joint is made between the cylinder c and ram a by means of the cupped packing g on the top of the said ram a, as represented in Fig. 2. A slot, a2, is cut in the ram a, in which slot a key, h, secured to the cylinder c by the screw i, slides, the said key preventing the cylinder from turning upon the ram when weight is applied to the said cylinder. The pump f is screwed into the top of the cylinder, as represented. k is the plunger of the pump, the upper end of which plunger works in the hole l in the upper end or cover of the reservoir e. The said plunger is worked by the hand-lever m, :fitted on the end of the shaft or axis n. The said shaft or axis n has a tongue-cam or forked lever, o, which tonguecam or forked lever works in the opening p in the said plunger 7c, and by its motion therein raises or lowers the said plunger and actuates the pump. The liquid from the reservoir e is conveyed to the cylinder c, so as to raise the jack, and returned from the Tsaid cylinder to the reservoir, so as to lower the jack, in the following manner: The inlet-valve q of the pump (see Fig. 2) is fitted on a small brass seat, and

the valve-case containing the said valve issprewed into the side of the pump, near the top of the cylinder c. The valve q is kept to its seat by the helical spring r. The outlet-valve s is situated in the axis of the pump and in a line with the axis of the plunger 7c, the said valve being kept to its seat by the helical sprin g t. By working the hand-lever m the plunger lo is raised and lowered in the pump through the cam or tongue o and axis n., and the liquid from the reservoir e is forced into the cylinder c, and the said cylinder` and parts carried by it raised. On the side of the reservoir e a pin, c, is situated, the object of the said pin being to limit the descent of the hand-lever m during the raising of the jack. The liquid in the cylinder is returned to the reservoir, when the jack is required to be lowered, by means of the lowering-valve u. The said lowering-valve is situated and works in the hollow of the plunger lc, and is kept toits seat by the downward pressure of the tongue or cam o, the edge of the said tongue or cam pressing on the top of the said valve so long as the hand-lever m is not depressed below the pin 'v on the outer side of the cylinder c. When, however, it is required to lower the jack, the hand-lever mis.

shifted on the shaft or axis n, so as to clear on its descent the pin or stop fu, and be enabled to take the position represented in Fig. 2. When the lever m is brought into the last-described position, the edge of the cam or tongue o no longer presses upon the valve u, and the said valve may be raised from its seat by pressure underneath it, and forced into the slot o2 in the end of the cam or tongue o. At the same time the lower end of the plunger k forces the outlet-valve s from off its seat, and the liquid from the cylinder c passes through the valves s and uto the reservoir e, and thereby lowers the jack.

Fig. 4 represents in vertical section another arrangement for opening the valves so as to lower thejac-k; ,andr Fig. 5 is a horizontal section ot' the same, taken through the line w,

Fig. 4. In this arrangement a third or lowering valve, as described, and represented in Fig. 2, is dispensed with. The inlet-valve x and outlet-valve y are arranged similarly to the valves q s, Fig. 2; but the Valve w has an elon gated stem or head, z, with a hole in the center thereof. The bottom end of the plunger 2 is contracted, asrepresented. On depressing the hand-lever m below the stop-pin fu, as before explained, in order to lower the jack, the contracted end ofthe plunger 2 passes through the hole in the head z ofthe valve .fr and with drawsthe said Valve, and at the same time strikes against thevalve y and forces Yit fromits seat. The water-ways of the said valves .r y are thereby opened, and the liquid from Vthe cylinder returns through the said water-ways to the reservoir, and thus lowers thejack.

The arrangement of the parts of my improved jack may be applied to presses, and for raising and pressing purposes generally.

The arrangement of the pump of the hydraulic jack may be applied 'to-hydraulic jacks of other constructions, and to hydraulic presses and raisingmachinery in general.

Having now described the nature fof my invention and the manner in which the same is to be performed, l wish it to be understood that I do not limit myself to the details herein described and represented, as the same may be by which the lowering of the said jacks is effected, hereinbefcre described, and illustrated in Figs. 2,4, and 5 ofthe accompanying draw ings.

JAMES TANGYE.

Witnesses GEORGE SHAW,Y RICHARD SKERRETT,

Both of Birmingham. 

